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Using the GNU Compiler Collection (GCC)

4.11 Preprocessing directives

• How sequences in both forms of header names are mapped to headers or external source file names (6.4.7).

• Whether the value of a character constant in a constant expression that controls conditional inclusion matches the value of the same character constant in the execution character set (6.10.1).

• Whether the value of a single-character character constant in a constant expression that controls conditional inclusion may have a negative value (6.10.1).

• The places that are searched for an included `<>' delimited header, and how the places are specified or the header is identified (6.10.2).

• How the named source file is searched for in an included `""' delimited header (6.10.2).

• The method by which preprocessing tokens (possibly resulting from macro expansion) in a #include directive are combined into a header name (6.10.2).

• The nesting limit for #include processing (6.10.2).

• Whether the `#' operator inserts a `\' character before the `\' character that begins a universal character name in a character constant or string literal (6.10.3.2).

• The behavior on each recognized non-STDC #pragma directive (6.10.6).

• The definitions for __DATE__ and __TIME__ when respectively, the date and time of translation are not available (6.10.8).